package com.itheima.filter;


import com.alibaba.fastjson.JSON;
import com.itheima.common.BaseContext;
import com.itheima.common.R;
import lombok.extern.slf4j.Slf4j;
import lombok.val;
import org.springframework.stereotype.Component;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.nio.file.PathMatcher;

@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {


        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;


        //1.获取本次请求的URI
        String requestURI = request.getRequestURI();

//        log.info("拦截到请求{}",requestURI);

        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login"
        };

        //2.判断本次请求是否需要处理
        boolean check = check(requestURI, urls);

        //3.如果不需要处理，则直接放行
        if (check) {
            filterChain.doFilter(request, response);
            return;
        }

        //4.判断登录状态，如果已经登录，则直接放行
        if (request.getSession().getAttribute("employee") != null) {

            Long empId = (Long) request.getSession().getAttribute("employee");

            BaseContext.setCurrentId(empId);

            filterChain.doFilter(request, response);
            return;
        }

        if (request.getSession().getAttribute("user") != null) {

            Long userId = (Long) request.getSession().getAttribute("user");

            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request, response);
            return;
        }

        //5.如果未登录则返回登录结果
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    /**
     * 检查本次请求路径是否需要放行
     *
     * @param requestURI
     * @return
     */
    public boolean check(String requestURI, String[] urls) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match) {
                return true;
            }
        }
        return false;
    }
}
